Question

Compound A reacts with aqueous hydrochloric acid to release a greenish yellow gas B with choking pungent smell. Choose the option correctly depicting the compound A and gas B.​

• A. A :$Mn{O}_2$ , B: $O_2$
• B. A: $MnC{l}_2$,B: $O_2$
• C. A: $MnC{l}_2$, B: $C{l}_2$
• D. A : $Mn{O}_2$ , B: $C{l}_2$

Answer 1

The correct option is D A : $Mn{O}_2$ , B: $C{l}_2$

• As told in the question, gas B has a greenish yellow colour and a pungent smell. So the gas is Chlorine gas.
• As we discussed before, when $Mn{O}_2$ reacts with aqueous $HCl$ then it gives $MnC{l}_2$ , water and Chlorine gas is evolved.
• The reaction is given as: $Mn{O}_2\left(s\right)+4HCl\left(aq\right)\to MnC{l}_2\left(aq\right)+2H_{2}O\left(l\right)+C{l}_2\left(g\right)$
• The correct option is C.